Path: csiph.com!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Jean-Michel Newsgroups: comp.sys.acorn.misc Subject: Re: Sprite files Date: Fri, 28 Feb 2025 20:37:28 +0100 Organization: Jean-Michel Lines: 45 Message-ID: References: <5bf32b2585newslists@npost.uk> <5bf3a4da5fnewslists@npost.uk> <5bf3aa4d8bdave@triffid.co.uk> <5bf3b9342anewsmcc@blueyonder.co.uk> <5bf41b6693dave@triffid.co.uk> <5bf5356db2dave@triffid.co.uk> <5bf5501d72newslists@npost.uk> <93f055f55b.harriet@bazleyfamily.co.uk> <5bf5f2ac6enewslists@npost.uk> <7f87f9f55b.harriet@bazleyfamily.co.uk> <5bf5fe3e31newslists@npost.uk> <5bf635f458Spambin@argonet.co.uk> <23143df65b.jmb@jmc.bruck.orange.fr> <5bf653afc0newslists@npost.uk> <6fa15bf65b.harriet@bazleyfamily.co.uk> Injection-Date: Fri, 28 Feb 2025 20:37:33 +0100 (CET) Injection-Info: dont-email.me; posting-host="a3a14bce98537e8a90afb4b2a361ab07"; logging-data="4009041"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19aIZzrRCJecoZ4g4qaZLH6NZwdgXkRodQ=" User-Agent: Messenger-Pro/9.01 (MsgServe/9.01) (RISC-OS/5.31) NewsHound/v1.53-32 RC1 Cancel-Lock: sha1:nOjgg3zOWUWPatngNG1M83kJvkE= X-Editor: EmailEdit 2.04 Xref: csiph.com comp.sys.acorn.misc:21611 In message <6fa15bf65b.harriet@bazleyfamily.co.uk> Harriet Bazley wrote: > On 28 Feb 2025 as I do recall, > Chris Newman wrote: >> In article <23143df65b.jmb@jmc.bruck.orange.fr>, Jean-Michel >> wrote: > [snip] >>> !DPLngScan has a function that helps a lot: histogram, To test, >>> Important: change to monochrom and the size of the document before >>> (300%) >> >> never used histogram.I must explore that. >> > How do you use a histogram? (I always thought it was just a form of > graph displaying the maximum number of pixels in each colour or > something - it never seemed like very useful information....) I will try to explain, (a video would be better ...) taking the example of SharpEye. First, I Convert the Drawing to greyscale (256 levels), and increase size by 300%. Then, I open with menu the Histogram window. ( R=G=B) You can see the density of the values (between 0 and 255), well otfen they are almost all very close which will prevent the OCR from working. To have a good result it is necessary that this density is better distributed between 0 and 256, which is 2 arrows of the histogram tool makes it possible to make UNDO allows you to test until you get a well contrasting image for the elements to be analyzed. For example for Sharpeye the lines are essential ... So you have to test, but you can use this process with photographs (jpeg, greyscale if possible) This requires a little training, but worth it! I hope my explanation is clear enough. I think it's useful because according to this discussion, SharpEye is underused and it must be the same for !Sleuth. -- Jean-Michel